Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b988e9c0c527abe…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 15:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 63582a7c42ff172dda15f4be493e0e2d SHA-1: a16df34b54c2e717e9888247a443659314391611 SHA-256: 5b988e9c0c527abe0ec9f7319cdb0082efa9cac5e0710e344d7caaa907a876ca
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on disposable domains, characteristic of a link farm used to obscure malicious destinations. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic strongly indicates a credential phishing attempt impersonating a brand, directing users to a redirector URL. While no scripts were extracted, the PDF structure and heuristics point to a phishing lure designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/kadamifix-tizebefi-buzabar.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/wix?keyword=special+products+worksheet+pdf PDF link annotation
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/kadamifix-tizebefi-buzabar.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/gavabadewuginif.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/6088326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_6041d5894cf87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6014d79fcf03e.pdfIn PDF document text
    • http://bubutun.iblogger.org/what_was_the_magna_carta_easy_definition.pdfIn PDF document text
    • http://zuropofi.22web.org/35173706143.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/8aHhojb/zombie_3d_fire_shooter_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/he0AhiK/53939354238.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/76aibGT/10463939059.pdfIn PDF document text
    • https://xaliwituxezaxe.weebly.com/uploads/1/3/5/3/135323019/pofamu-nexex-xemulebul.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/7893357.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/hh5hdih/62517281684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2908cef-3181-4af0-b1c8-6b2645777bd1/56863956385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801aeafd-28b8-44af-8e13-c38b1d97ba93/saguwapototabid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82ef6fc-5cd8-4838-b05e-a9364194a8d2/why_is_heat_flashing_on_my_thermostat.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_c53d3df355c348a393247c7bec315ed9.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_744e61cb92a847728fc8319aec5b13af.pdf?index=trueIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_b712e586f34645b08edd039347e9cef5.pdf?index=trueIn PDF document text
    • http://xevupabiko.rf.gd/15576486452.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/bapumon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 5500 bytes
SHA-256: fd2a106ce37f08b1a3e511f19527d65b0818a5c1cf16b69b65f8872f53e62b2b
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10952 bytes
SHA-256: 88ec225ed2fc9c0f841129a385e458fb6af5277e4a6fbdfacde4cdc19686c141
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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